phase linear amp or is it?

[Darkknigh_t]

i need some help people. i just got this hi fi amp and on it it says phase linear integrated amplifier 2400-A. now when i googled it nothing comes up. this amp is old and still working great. now i need some help identifying it. it could be hand built but i dont know seems like someone went through the trouble of making it almost identical the lettering and everything. im just trying to find out more about it. i would aprichiate any help and i can take some pictures of the insides if needed. it has alot of carbon composite resistors and alot of other vintage components.
thank you for your help

ps a picture of the amp front and back.

[stecykmi]

no idea where it came from, but what's the construction technique? point to point or turret board? 1 sided PCB? 2 sided? this will give you a big clue as to when it was manufactured at least...

[raulduke]

Yep; open it up and have a look whats inside.

Either way, it looks really cool.

Nice score!

[Darkknigh_t]

abroad at the moment but at the back i have 2n3773 transistors and inside its multiple pcbs singlesided. there are alot of big light blue caps. the thing is phase linear are made in the 70s so this could be either original or handmade. i doubt they would put a switch like that on the front and by far as i can tell the input selection switch i didnt see on the original amps so if its handmade clone someone went through alot of trouble making all these extra options